The AT series temperature controls feature adjustable fan or limit operation in a versatile 3/4 in. 19 mm bimetal disc design. The snap-action of the temperature sensing bimetal provides high-speed contact separation for exceptional life. Series covers almost 95% of heater and dryer applications.40 adjustable range1/4 in. quick connect terminalsOpen on riseUL recognizedCSA approved. WARNING: This product can expose you to chemicals including Nickel and Nickel compounds, which are known to the State of California to cause cancer. For more information, go to www.P65Warnings.ca.gov